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• ffmpeg guys help me out why is this not working no error last process is not getting executed

  13 juin 2013, par finch986

  String exe = "chmod 777 /data/data/com.demo.videocomparedemo/ffmpeg"/*+" -i TEST8.mp4 -acodec copy -vf \"transpose=1\" TEST8-1.mp4"*/;
  
  Process process = runtime.exec(exe,null,null);
  
  process.waitFor();
  
  process.destroy();
  
  
  
  String src="/mnt/sdcard/Swingpro/TEST8.mp4";
  
  String exe1 = "chmod 777 "+src/*+" -i TEST8.mp4 -acodec copy -vf \"transpose=1\" TEST8-1.mp4"*/;
  
  Process process1 = runtime.exec(exe1,null,null);
  
  process1.waitFor();
  
  process1.destroy();
  
  
  
  File file = new File("/mnt/sdcard/Swingpro", "TEST9.mp4");
  
  boolean retVal = false;
  
  if(file.exists()){
  
      if(file.isDirectory()){
  
          retVal = file.delete();
  
      }
  
  }
  
  file.createNewFile();
  
  
  
  String src1="/mnt/sdcard/Swingpro/TEST9.mp4";
  
  String exe2 = "chmod 777 "+src1;
  
  Process process2 = runtime.exec(exe2,null,null);
  
  process2.waitFor();
  
  process2.destroy();
  
  
  
  
  
  File dir = new File("/mnt/sdcard/SwingPro");
  
  
  
  List<string> args = new ArrayList<string>();
  
  args.add ("/data/data/com.demo.videocomparedemo/ffmpeg"); // command name
  
  args.add ("-i "+src); // optional args added as separate list items
  
  args.add("-acodec copy ");
  
  args.add("-vf \"transpose=1\" "+src1);
  
  
  
  
  
  ProcessBuilder pb = new ProcessBuilder (args);
  
  Process p = pb.start();
  
  p.waitFor();
  
  </string></string>

• lavf : do not derive timebase from avg_frame_rate

  5 avril 2021, par Anton Khirnov

  lavf : do not derive timebase from avg_frame_rate
  avg_frame_rate is the _average_ framerate, its presence does not
  
  guarantee that the stream is CFR, so it should not be used for setting
  
  the timebase.
  

  • [DH] libavformat/utils.c

• Upgrading an existing h.264 solution of Level-4.1 to support 4K(Level-5.2)

  11 août 2015, par Codec Guy

  I am currently studying to support 4K(3840x2160) on H.264 Encoder.
  When I studied the specs of H.264, it says 4K resolution is supported in Level-5.2(XAVC).
  In order to check the implementation I encoded my full HD(1920x1080)bitstream using x264 in FFMPEG for three different levels(Level-4,4.1 and 5.2).

  Here is what I noticed
   All the three Encoded bitstreams, encoded for different levels matched pixel by pixel.
   I was wondering if the encoding is done for different levels(Level-4,4.1 and 5.2), how come there is no change in bitstream.

  • I have a solution of high 422 Level-4.1, are there any changes in the core modules like Transformation, Quantazition, CAVLC to support 4K(3840 x 2160)/XAVC.

  • or the processing of all Level-5.2 is same as Level-4.1.

  It would be very helpful, if somebody can refer me to any documents which explains the diffrence in processing of H.264/AVC and XAVC